Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..568w&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, July 15, 1977, p. 568-573.
Astronomy and Astrophysics
Astrophysics
20
B Stars, Binary Stars, Line Spectra, Spectrum Analysis, Stellar Spectrophotometry, X Ray Sources, H Alpha Line, H Beta Line, Interstellar Extinction, Spectral Energy Distribution, Stellar Atmospheres, Stellar Luminosity
Scientific paper
Narrow-band spectrophotometric observations of HDE 245770 with the multichannel spectrometer and slit spectra obtained with the SIT digital spectrograph at the Cassegrain focus of the 5-m Hale telescope indicate that this star is of spectral type B0 with emission at H-alpha, H-beta, and probably 5876 A of He I. There is some evidence that it is of luminosity class III. The reddening is estimated in various ways and corresponds to a B-V color excess of 0.80. If the star is really a giant, its distance is approximately 1.8 kpc. No variations larger than 1% at the reported 104-x X-ray pulse period are evident in the data in visual magnitude, color, or H-alpha emission intensity. This is not surprising, since the optical star is much more luminous than the X-ray object, and the heating effect of the X-ray source (which is assumed to be one component of a binary) on the B0 star's atmosphere can produce at most a few percent modulation in visual light.
Oke Bev J.
Wade Richard A.
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